.... among some of Britain's urban Muslims - nearly half of whom were born in the UK and are under 24 - there's a belief that leaving Islam is a sin and can even be punished by death.
An investigation for the BBC has found evidence of young people suffering threats, intimidation, being ostracised by their communities and, in some cases, encountering serious physical abuse when they told their families they were no longer Muslims.
There are also local councils that seem to have little awareness of the issue or any policy on how to protect these vulnerable young people.
There are no official statistics on apostasy in British Islam, and only a few academic studies based on a tiny handful of individual cases.
.... Ayisha (not her real name) from Lancashire was just 14 when she began to question Islam after reading the Koran. She started rebelling over wearing the hijab, but eventually decided she wasn't a Muslim and the situation at home rapidly got worse.
"My dad threatened to kill me by getting a knife and holding it against my neck and saying: 'We might as well do it if you're going to bring this much shame to the family.'" [BBC] Read more